Attachment for holding drill-tubes



(No Model.) 2 Sheets-Sheet 1. T. R. CRANE.

ATTACHMENT POR HOLDING DRILL TUBES.

No. 418,503. Patented Deo. 31, 1889.

gl@ Mw BY @Naw ATTORNEY.

'(No Model.) 2 sheets-sheet 9.4

T. R. CRANE. i v.AlTAGHMRNT FOR HOLDING DRILL TUBES. No. 418,503.l I Patented Dec. 3l, 1889.

l"l F595' Fig. E.

INVENTOR:

ATTORNEY.

UNITED STATES v PATENT OFFICE.

THOMAS R. CRANE, OF HEATHSVILLE, VIRGINIA.

A'II'TACHMENT FOR HOLDING DRILL-TUBES.

SPECIFICATION forming part of Letters Patent No. 418,503, dated'Dece-mber 31, 1889.

y Application filed May 9, 1889. Serial No. 310,121. (No model.)

Heathsville, in the county of Northumberland and State of Virginia, have invented certain new and useful Improvements in Attachments for Holding Drill-Tubes, of which the follow-` ing is a specification.

This invention relates to a holder for drilltubes and barrow-teeth, and willbe described and then claimed.

In the drawings herewith, Figure lis aside View of a frame mounted on wheels, being part 01": a grain drill or harrow such as Letters Patent have heretofore been granted to me for. Fig. 2 is a side View, partly in section, of the holder and a drill-tube. Fig. 3 is a top view of same. Fig. 4 is a view of the movable part of the jointed holder. Fig. 5 shows a portion of the top part of the drilbtube. Fig. 6 shows two views of the tens-iolrlever. Fig. 7 shows two views of the link. Fig. 8 shows two views of the tensionbolt. Figs. 9 and l0 show a modification in in the holder, and illustrate a barrow-tooth applied thereto instead of a driILtube.

The frame B,axle C,wl1eelC, castenwheel U, and vertically-movable crosswise bar F below the frame are all well known, and may be like those parts described in Letters Iatent heretofore granted me.

This invention comprises a drill-tube holder to be attached to the crosswise bar F for holding the tube E. i

The object of the improved holder is to retain the drill-tube F. in its normal position for work at all times, except when it is subjected to undue strain, as when the point at the lower end of the drill-tube strikes an obstruction, as a root or stone that is immovable. Then it is the design that the holder will yield to allow the drill-tube to swing back out of the way of the said immovable obstruction.

The holder comprises the stationary part will then yield. The drill-tube E is attached in any suitable way to the said movable part.

In Figs. 2 to S details are shown for one form of retaining device. The stationary part G has an upward curved arm c o', consisting of two plates. A tension-lever I is jointed by one end d to the said upwardcurved arm, and from said joint projects back toward the movable part H, with which a link J connects it by joints e f. The joint e, which connects the tension-lever I and link J, has shoulders e', and forms an elbowjoint which allows the parts to bend one way only. The upward-curved arm c c has aseat g, and a tension-bolt K is jointed at h to the tension -lever I and projects loosely through the said seat, and a spiral spring L surrounds thebolt, one of its ends bearing on the saidseat and the other against a nut z', screwed onto the bolt. The tension of this spring L, acting on the bolt, draws on the lever I and keeps said lever and the link J straight or in line with each other, as shown in Fig. 2, which is the normal position for retaining the movable part H of the holder where it will serve for work. Vhen a severe strain comes on these parts, as will be the case if the drill-tube point meets an immovable obstruction in the ground, the tension-lever I and link J will give way at the elbow-joint e and allow the movable part H to turn on its joint Z) and the drill-tube to swing back as soon as the obstruction has been passed. The tension of the spring L by drawing on the lever I will restore the elbow-joint e to its normal position.

As already stated, the drill-tube E may be attached to the jointed part H of the holder Y in any desired way. In the present instance I have shown a tongue and groove for this purpose. The groove k is here shown on the holder part H, and the tongue Z is on the drilltube. This construction allows a chain j to be attached to the ring j on the drill-tube, and thereby each tube may be raised and lowered vertically.

A modification of the retaining device is shown in Figs. 9 and lO. Here the stationary part G of the holder has no upward-curved arm, but instead has a short arm c2, provided with a slotmand the movable part H of the IOG holder, which is jointed at b, has a staple n, which passes below the crosswise bar F, and through the said slot m a Wood pin 0, passed through the staple, retains the parts to this normal position. WVhen severe strain comes, the Wood pin o Will break, and movable part II Will turn on its joint b.

Figs. 9 and 10 illustrate a barrow-tooth p as being attached to the holder.

It is obvious that the construction of this device may be varied. My invention, therefore, is not limited to the precise construction shown.

Having described my invention, I claim- 1. A holder` for drill-tubes or barrow-teeth, comprising the stationary part G, a movable part II, connected by a joint to said stationary part, an arm attached to the stationary part and projecting forward and having a seat g, with a hole, a lever I, jointed to the arm and connected by a link J with the said movablepart, a bolt K, jointed to the said lever, projecting looselythrough the hole in the seat, and having at its extremity a nut and a spiral spring L, resting on the seat of said arm and bearing against the bolt-nut.

2. The combination of the crossWise barF, the stationary part G of a holder attached to said crosswise bar, a movable part H, con-v nected by a joint to the stationary part and provided with a vertical groove 7a for a drilltube or barrow-tooth, and a yielding retaining device which holds the said movable part to the normal position except when undue strain is applied.

In testimony whereof I affix my signature in the presence of two Witnesses.

THOMAS R. CRANE. Vitnesses:

JOHN E. MORRIS, JNO. T. MADDOX. 

